docs: def getOverlayAlpha(self, ulOverlayHandle):
          """Gets the alpha of the overlay quad. By default overlays are rendering at 100 percent alpha (1.0)."""
  
          fn = self.function_table.getOverlayAlpha
          pfAlpha = c_float()
          result = fn(ulOverlayHandle, byref(pfAlpha))
          return result, pfAlpha.value